1. Whale of a Tale. Every year from mid-May to September, plankton in the waters off Isla Mujeres attracts hundreds of hungry whale sharks. Snorkel with these gentle giants on a fun half-day tour. ecotravelmexico.com
2. The Shoe Fits. Spot turtles, parrotfish and eels hiding among the coral canyons at Cozumel’s Horseshoe on Palancar Reef. diveparadise.com
3. A Truly Mayan Masterpiece. Tour the Mayan ruins at Tulum, spectacularly situated on 40-foot cliffs overlooking the Caribbean Sea.
4. Devil Inside. Go down Devil’s Throat at Cozumel’s Punta Sur dive site, a tunnel lined with red sponges that divers enter at 80 feet and exit into the blue at 120. scubaclubcozumel.com
5. On the House. If you’re staying at Presidente Intercontinental in Cozumel, drop in on the hotel’s house reef. In only 20 feet of water, you’ll see abundant life like cryptic scorpionfish, sinuous yellow snake eels and tons of juveniles. scubadu.com
6. Earthly Delight. The Yucatán peninsula is pockmarked with divable cenotes like Dos Ojos and Chac Mool. Follow an experienced guide into these ethereal, cathedrallike sites. prodivemex.com
7. Underwater Art. It’s a 30-foot dive at artist Jason deCaires Taylor’s Museo Subacuático de Arte, a collection of life-size sculptures scattered on the seabed between Cancun and Isla Mujeres. cruisedivers.com
8. Totally Nuts. Sit atop Cozumel’s only cliff at Coconuts, a friendly bar and restaurant on the east side. coconutscozumel.com
9. Beach Bum. Rent a beach chair and umbrella for less than $10 a day at Playa Norte, the prettiest beach on Isla Mujeres.
10. Secret Cenote. Explore a cenote from a different perspective as you spelunk and swim through the vast underwater cavern of Rio Secreto. riosecreto.com